Element for a toy building set



FIG. 1 is a top perspective view of the element for a toy building set showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a side elevational view thereof, all sides being identical;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for an element for a toy building set, as shown and described. 